Your GM truck also doesn't have triple door seals that make it quieter
Unfortunately because the outermost seal also keeps water out of the door
jamb area (unlike single seal affairs that allow water to drain down to the
bottom and off the rocker panel) it tends to freeze up.
Sounds like you go from warm to cold and get lots of snowmelt. You might
try applying de-icer directly to the outer rubber seal. Personally, I've
had trouble getting into my 330xi in conditions that are certainly as severe
as what you have; but I don't have a lift-gate either.
Thats a common problem on 2001 X5's
I had the same problem,: Doors freeze shut - when you finally get in they
either wont shut - or they shut and freeze on you while youre in the car.
I complained to my bmw service center about this (i was lucky enough to
drive to them and could not even get out of the car :-( so i called them on
the phone - they came out to investigate on the parking lot.
They kept my car (this is a safety issue as you micht not be able to get out
of your car in case of an emergency), opened up all the doors (removing all
the inside fabric and stuff) and dried them up with heat - applied fresh
silicone on all door seals, applied new lubricant to all latches and
whatever is in the doors that need lubricants.
I've had no problems since then.
Look out for being locked in your car - and then complain on safety issue.
You'll get a fix with no cost.
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